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GT – MHR Reactor Cavity Cooling System

GT – MHR Reactor Cavity Cooling System. RCCS. RCCS-SNU: water-pool type RCCS -- water natural convection -- air force convection. Seoul National University. Conduction – radiation – convection .

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GT – MHR Reactor Cavity Cooling System

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  1. GT – MHRReactor Cavity Cooling System

  2. RCCS RCCS-SNU: water-pool type RCCS -- water natural convection -- air force convection Seoul National University Conduction – radiation – convection “Heat Transport and Afterheat Removal for Gas Cooled Reactors Under Accident Conditions”, IAEA-TECDOC-1163, 2000.

  3. Conclusion from Idaho Nation Laboratory May 24 – 27, 2010 Heat removal mechanisms from RPV to cavity: – Thermal radiation (~80%) – Convection (~20%) RCCS heat removal mechanisms: Active cooling: air forced-convection Passive cooling: water boiling heat transfer & air natural convection 1. Accident fuel temperatures are insensitive to RCCS performance 2. Vessel temperatures are more sensitive to RCCS performance but still not a strong function 3. Reactor cavity concrete temperatures are a strong function of RCCS performance Y.J. Cho, M. O. Kim, G. C. Park, "Measuring Characteristics on Emissivity Using Infrared Thermometer for RCCS," NTHAS4: Fourth Japan-Korea Symposium on Nuclear Thermal Hydraulics and Safety, Sapporo, Japan, November 28-December 1, 2004

  4. Pool type RCCS Example Side tank & 12 pipes with one loop meshed 12 Bended pipe vs. straight pipes ?

  5. Experiment (a) Upper tank of the test facility (b) Side water tank

  6. Schematic diagram of the test facility

  7. Detail dimensions

  8. (80% radiation 20% conduction)

  9. 1/10 linear scaled 1/1000 volume. • 1/100 power scale. • Heat flux is preserved in the proto and model • Time scale is reduced to 1/10. • Axial distribution of temperature in water pool is not considered. • Scaling analysis is carried out to derive the similarity criteria of RPV temperature.

  10. Constant heat flux • Heat flux distribution • Cavity natural circulation(20%, 50%, 80% Helium) • Boiling heat transfer of water pool 5. Air natural convection (chimney height)

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